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Influence of advanced engineering measures on displacement and stress field of surrounding rock in tunnels crossing active strike-slip faults

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Frontiers of Structural and Civil Engineering 2023年第10期17卷 1477-1501页

作者： Hui ZHOU Jiancheng XIAO Manchao HE Jingjing LU Zhigang TAO Futong XU Congcong HOU State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyBeijing 100083China School of Mechanics and Civil Engineering China University of Mining and TechnologyBeijing 100083China

Based on significant improvements in engineering materials,three advanced engineering measures have been proposed-super anchor cables,high-strength concrete anti-fault caverns,and grouting modification using high-strength concrete-to resist fault dislocation in the surrounding rock near tunnels crossing active strike-slip ***,single-or multiple-joint advanced engineering measures form the local rock mass-anti-fault(LRAF)method.A numerical method was used to investigate the influence of LRAF methods on the stress and displacement fields of the surrounding rock,and the anti-fault effect was ***,the mechanism of action of the anchor cable was verified using a three-dimensional numerical *** numerical results indicated that the anchor cable and grouting modification reduced the displacement gradient of the local surrounding rock near the tunnels crossing ***,anchor cable and grouting modifications changed the stress field of the rock mass in the modified *** tensile stress field of the rock mass in the modified anchor cable area was converted into a compressive stress *** stress field in the modified grouting area changed from shear stress in the fault slip direction to tensile stress in the axial tunnel *** anti-fault cavern resisted the dislocation displacement and reduced the maximum dislocation magnitude,displacement gradient,and shear *** the three advanced engineering measures,the anchor cable was the core of the three advanced engineering *** anchor cable,combined with other LRAF measures,can form an artificial safety island at the cross-fault position of the rock mass to protect the *** research results provide a new supporting idea for the surrounding rock of tunnels crossing active strike-slip faults.

关键词： anti-fault effect engineering measures LRAF method stress and displacement field tunnel-crossing active faults

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